In geophysical terms, the Moon is a planetary-mass object or satellite planet. Its mass is 1.2% that of the Earth, and its diameter is 3,474 km (2,159 mi), roughly one-quarter of Earth's (about as …

Dec 26, 2025 · Moon, Earth’s sole natural satellite and nearest celestial body. Known since prehistoric times, it is the brightest object in the sky after the Sun. Its name in English, like that …

Dec 15, 2025 · Europe's plans to develop its "Argonaut" robotic moon lander are moving ahead with the announcement of an Italy-led consortium that will build a key element of the spacecraft.

The Moon: Complete and live astronomy data, visibility information, sky charts, graphs, and tools for sky-watchers at all levels.

On July 20, 1969, humans walked on the Moon for the first time.We look back at the legacy of our first small steps on the Moon and look forward to the next giant leap.

Dec 29, 2025 · The Moon makes Earth more livable, sets the rhythm of ocean tides, and keeps a record of our solar system's history. Explore NASA lunar science here.

Nov 19, 2021 · What Is the Umbra? The umbra is the dark center portion of a shadow. The Moon's umbra causes total solar eclipses, and the Earth's umbra is involved in total and partial …

What is the moon made of, and how did it form? Learn about the moon's violent origins, how its phases shaped the earliest calendars, and how humans first explored Earth's only natural …

2 days ago · With our 2026 Moon Phase Calendar, you'll find the current Moon phase for tonight—plus, all the phases of the Moon for each day of the month.

6 days ago · The moon and sun figure big in the new year’s lineup of cosmic wonders Here’s a rundown on what the universe has in store for us in 2026.